Machine Design
In helical gears, the right hand helixes on one gear will mesh __________ helixes on the other gear.

Left hand
Right hand
Both A and B
None of these

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Machine Design
In worm, gears, pitch lead angle is

None of these
The angle between the tangent to the pitch helix and an element of the cylinder
The angle between the tangent to the pitch helix and the plane of rotation
Half the angle between two inclined faces in axial plane

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